Telescope sight mount for firearms with elevation and windage adjustment means



Dec. 18, 1956 E. T. LAKE ETAL 2,774,142

TELESCOPE SIGHT MOUNT FOR FIREARMS WITH ELEVATION AND WINDAGE ADJUSTMENTMEANS Flled May 17 1954 United States Patent TELESCOPE SIGHT MOUNT FORFIREARMS WITH ELEAVBASTION AND WINDAGE ADJUSTMENT ME Ernest T. Lake andRobert R. Hardgrove, Livingston, Mont.

Application May 17, 1954, Serial No. 430,216

4 Claims. (Cl. 3350) This invention relates to telescopic sight mountsfor firearms of extremely simple construction which may be veryeconomically manufactured yet which, due to its unique construction,includes means whereby elevation and windage adjustments may be made forthe telescopic sight.

A further object of the invention is to provide a telescopic sight mountinvolving a minimum number of parts forming a unique combination andwherein certain of the parts accomplish dual functions enabling theaccomplishment of the elevation and windage adjustments.

Various other objects and advantages of the invention will hereinafterbecome more fully apparent from the following description of thedrawing, illustrating a presently preferred embodiment thereof, andwherein:

Figure 1 is a plan view showing the sight mount in an applied positionsupporting a telescopic sight;

Figure 2 is a fragmentary side elevational view on an enlarged scale ofa portion thereof;

Figure 3 is a fragmentary bottom plan view of the sight mount portionillustrated in Figure 2; a

Figure 4 is an enlarged longitudinal sectional view taken substantiallyalong a plane as indicated by the line 4--4 of Figure 1;

Figure 5 is a cross sectional view through the rear unit of the sightmount taken substantially along a plane as indicated by the line 55 ofFigure 4, and

Figure 6 is an enlarged cross sectional view through the front unit ofthe sight mount, taken substantially along a plane as indicated by theline 6-6 of Figure 1.

Referring more specifically to the drawing, the improved telescopicsight mount comprises two mounting units, designated generally 8 and 9.The mounting unit 8 includes a base 10 and a sight barrel engaging clamp11. The mounting unit 9 includes a base 12 and a sight barrel engagingclamp 13.

The base 10 of the unit 8 comprises an elongated bar of substantiallyuniform width from end-to-end thereof having substantially parallel sidewalls 14. The bottom 15 of the bar 10 is slightly arced transverselyfrom end-toend thereof to provide a slightly concave face and saidbottom surface 15, as seen in Figures 3 and 5, is preferably groovedlongitudinally. The bar 10 is provided near its ends with openings 16extending therethrough having enlarged upper ends 17 which openoutwardly of the top surface 18 of the bar 10. Said top surface 18 isflat and smooth with the exception of the openings 16 and is inclinedfrom end-to-end thereof, as illustrated in Figures 2 and 4. Headedthreaded fastenings 19 are turnably disposed in the openings 16 and havethe heads thereof countersunk in the enlarged opening portions 17. T hefastenings 19 are adapted to threadeclly engage threaded sockets 20which open through the upper surface 21 of a firearm portion, such asthe receiver of a rifle, and said threaded sockets 20 are longitudinallyspaced whereby when the fastenings 19 are engaged thereby the base 10will be disposed on top of and longitudinally of the firearm portion 21.Said firearm portion 21 is transversely 2,774,142 Patented Dec. 18, 1956and convexly arced and the bottom surface 15 is concavely arcedtransversely to fit flush thereagainst, as seen in Figure 5. The base 10is secured to the firearm portion 21 so that its top surface 18 will beinclined downwardly and forwardly toward the muzzle end of the firearm.

The clamp 11 constitutes a modified split ring having a circular opening22. The clamp 11 has a thickened base or bottom portion 23 provided witha downwardly opening notch 24 of a width greater than the width of thebase 10 and of a depth less than the depth of said base 10 at the lowerend of its sloping top surface 18. The top surface 25 of the notch 24 isinclined or sloped from side to side of the ring, as seen in Figure 4,corresponding to the slope of the base surface 18. The notch 24 formsdepending legs 26 forming bottom portions of the clamp bottom 23 andwhich are provided with threaded bores 27 which open into the notch 24and outwardly of side edges of the clamp 11 to threadedly receive setscrews 28 having rounded inner ends 29. The top portion of the clamp 11is centrally split as seen at 30, the split 30 forming a gap between thetop clamp portions 31 and 32. The clamp portion 31 has a threaded bore33 extending therethrough one end of which opens into the gap 30 andaligns with a larger unthreaded bore 34 of the clamp portion 32. Theopposite end of the unthreaded bore 34 is enlarged as seen at 35 andopens outwardly of the clamp 11. A screw 36 turnably engages the bore 34and threadedly engages the bore 33. The head 37 of the screw 36 turnablyfits in the bore portion 35 and abuts against the inner end thereof.

The base 12 of the other sight mount unit 9 is preferably circular andhas a diametrically extending grooved bottom portion 38 which seatsflush on the firearm top surface 21 in longitudinally spacedrelationship to the base 10 and which is detachably secured thereto by apair of screw fastenings, not shown, which extend through diametricallyspaced openings 39 in the base 12, which correspond to the openings 16,17, and which open through the grooved bottom 38 near the ends thereof.The base 12 is provided with a centrally disposed frustoconical shapedbore 40 which extends therethrough from top to bottom thereof and whichis tapered toward the top surface of the base 12.

The clamp 13 is formed of two substantially identical sections 41 and 42having substantially flat bottom surfaces 43 which rest upon the topsurface of the base 12. Said top surface of the base 12 is substantiallyflat and level. The clamp sections 41 and 42 have lugs 44 which dependfrom the inner ends of their bottom surfaces 43 and which extend intothe base opening 40. The lugs 44 have outer sides which aresubstantially semicircular in cross section and which taper upwardlytoward the bottom surfaces 43 and are shaped to engage flush against thewall of the bore 40 when the bottom surfaces 43 are resting on the base12. The clamp 13 has upper end portions 31a and 32a of its sections 41and 42, respectively, which correspond with the upper clamp portions 31and 32, respectively. The clamp portion 31a is provided with a threadedbore 330, corresponding to the bore 33 and the upper clamp portion 32ais provided with a bore 34a, 35a, corresponding to the bore 34, 35, asbest seen in Figure 6. Said bores are engaged by a screw 36a, 370,corresponding to the screw 36, 37. The clamp sections 41 and 42 areprovided with corresponding substantially semicircular inwardly openingnotches combining to form a substantially circular opening 45 when saidclamp sections are disposed in slightly spaced apart relationship to oneanother and in upright positions on the base 12 and with the lugs 44abutting against the wall of the bore 40. When the clamp sections 41 and42 are thus disposed a gap 46 exists between the upper and lowerportions of the clamp sections, as seen in Figure 6.

The unit 8 preferably constitutes the rear telescope sight mount unitand the unit 9 preferably constitutes the front sight mount unit.Assuming that the bases 10 and 12 are secured as previously described tothe upper surface of the firearm portion 21 in longitudinally spacedrelationship to one another, the fastening 36 is loosened to allow theclamp opening 22 to be enlarged so that a barrel 47 of a conventionaltelescopic sight 48 may be inserted through the clamp opening 22. Thefastening 36a of the clamp 13 is loosened substantially so that theupper portions 31 and 32 of the clamp sections 41 and 42, respectively,can be swung to move the lugs 44 into abutting engagement so that saidlugs can be inserted downwardly into the base bore 40, after which thelower portions of the clamp sections 41 and 42 are displaced apart totheir positions of Figure 6. With the fastening 36a still loosened, thesight barrel 47 can be inserted through or into the clamp opening 45,and with the setscrews 28 retracted out of the notch 24, said notch canbe positioned to engage over the base 10 and with its top surface 25resting on the top surface 18 of the base. The screws 28 are thenadvanced inwardly into the notch 24 and into clamping engagement withthe sides 14 of the base 10. The fastenings 36 and 3611 are thentightened for clamping the sight barrel 47 in the clamps 11 and 13. Thisoperation completes the mounting of the telescopic sight 48 on thefirearm portion 21 by the mounting units 8 and 9. As the fastening 36ais tightened the lugs 44 are displaced forcibly into flush engagementwith the wall of the bore 40 and while the upper clamp portions 31a and32a are drawn together for restricting the opening 45 to clamp the sightbarrel 47 therein. The clamp 11 is sufficiently resilient so that itsupper portions 31 and 32 can be drawn together by the fastening 36 forrestricting the bore 22 to clamp the barrel 47 therein.

It will be noted that when the fastening 36a is loosened that the lugs44 are capable of turning in the bore 40. To accomplish a windageadjustment of the telescopic sight 48, the fastening 36a is loosenedafter which one of the setscrews 28 is retracted and the other setscrew28 is advanced whereby the clamp 11 is diplaced laterally of the base 10to accomplish a desired windage adjustment of the telescopic sight 48 bylaterally moving the axis of the telescopic sight barrel 47 to aposition at an angle to the longitutdinal axis of the firearm par-t 21.This is made possible since the loosened clamp 13 is capable ofswiveling on the base 12 as the rear portion of the telescopic sight 48is moved laterally.

To accomplish an elevation adjustment, the fastening 36a-is loosenedafter which the two fastenings or setscrews 28 are loosened so that theclamp 11 can he slid longitudinally of the base 10 and while the barrel47 is sliding through the clamp 13 to move the inclined notch surface 25upwardly or downwardly along the inclined base surface 18 for eitherlowering or elevating the clamp 11 relatively to the clamp 13 foraccomplishing elevation adjustments. After the desired elevationadjustment has thus been accomplished the setscrews 23 are returned totheir initial positions for securing the clamp 11 to the base 10 and thefastening 36a is re-tightened for clamping the sight barrel 47 in theclamp 13.

It will be obvious that both elevation and windage adjustments may beaccomplished at the same time and that any windage adjustment may bemade with any elevation adjustment or vice versa.

Various modifications and changes are contemplated and may obviously beresorted to, without departing from the spirit or scope of the inventionas hereinafter defined by the appended claims.

We claim as our invention:

1. In a telescopic sight mount for mounting a telescopic sight above afirearm portion and longitudinally thereof, a mounting unit including abase, means securing said base to a top portion of a firearm, said basecomprising an elongated block adapted to be disposed longitudinally ofthe firearm and having a top face inclined from end-to-end thereofrelative to the top portion of the firearm, said mounting unit includinga clamp having an opening in which an end portion of a telescopic sightbarrel is adapted to be clamped, said clamp having a bottom portionprovided with a downwardly opening notch loosely straddling the baseancl're'sting on the inclined top face thereof, set screws mounted inthe bottom portion of said clamp and extending into opposite sides ofsaid notch and engaging opposite sides of said elongated base toadjustably securethe clamp thereon.

ZTTI'i'a telescopic sight mount as in claim 1, said clamp having aninclined surface extending from side to side thereof defining a topportion of said notch and conf-ormably fitting the inclined top face ofsaid elongated base, said clamp being longitudinally adjustable on theelongated base t vary the elevation.of.the barrel and engaged by theclamp relative to the other end of the telescopic sight barrel foraccomplishing elevation adjustments of the sight barrel, and said setscrews being selectively adjustable for laterally adjusting the clampand the barrel end engaged thereby relative to the elongated base and tothe other last mentioned barrel end foraccomplishing-windageadjustments' of the'sight barrel.

3. A telescopic sight mount comprising an elongated base adapted to besecured to a top surface of a firearm portion and longitudinally thereofand having substantially parallel side walls and a top face, said topface being inclined from end-to-end of the base, a sight barrel engagingclamp having a split top portion, fastening means engaging said splittop portion for restricting the clamp for securing a telescopic sightbarrel therein, said clamp having a bottom portion provided with a notchloosely engaging over said elongated base and providing spaced portionsof the clamp loosely straddling the base, set screws threadedly engagingsaid spaced bottom clamp portions and extending into the notch andengaging the side walls of the base for adjustably securing the clamp tothe base, said set screws being selectively adjustable for laterallyadjusting the clamp relatively to the base.

4. A telescopic sight mount as in claim 3, said clamp having an inclinedsurface extending from side to side thereof defining a top surface ofthe notch and conformably engaging the inclined top surface of the base,and said set screws adjustably securing the clamp to longitudinallyspaced portions of the base for supporting the clamp in differentelevated positions relative to the firearm portion on which said base issecured.

References Cited in the file of this patent UNITED STATES PATENTS1,816,195 Redfield July 28, 1931 2,202,000 Gray May 28, 1940 2,486,002Buehler Oct. 25, 1949 2,493,254 Leupold Jan. 3, 1950 2,585,395 Martin etal Feb. 12, 1952 2,653,386 Winton Sept. 29, 1953 FOREIGN PATENTS 21,595Great Britain 1912 8,644 Great Britain 1912

